I'm installed my first exchange 2007 server, the install for the Hub transport failed because of a known installation bug but I re-ran it from the command line with the /LegacyRoutingServer switch and it created the connectors between the two. The mail I try to send it stuck in the routing group connector's Queue. The ExchangeLegacyInterop security group is there and the 2003 bridgehead is a member. SuppressStateChanges is on.